Member for temporarily restoring road surface and method for temporarily restoring road surface

ABSTRACT

There is provided a temporary restoration member (lining mats ( 1 ), nonslip pins ( 2 ), lock pins ( 3 ), stoppers ( 4 ), fixing pins ( 5 )) for simplifying the construction work for temporarily restoring a road surface when a paved road surface (B) is excavated to lay piping, and a method for restoring the road surface using the member. Each of the lining mats ( 1 ) is a rectangular rubber plate provided with a thick central part ( 11 ), two thin side parts ( 12 ), and pinholes ( 16 ) at appropriate locations that pass through the mats from the front surface to the reverse surface. The lining mats are laid out to cover a backfilled surface so that the side edges of the mats are disposed on the paved road surface (B). Cylindrical nonslip pins ( 2 ) are driven into the pinholes, and lock pins ( 3 ) are driven into the cylindrical part of the nonslip pins to fix the lining mats. Latching protrusions ( 42 ) of stoppers ( 4 ) are inserted into the pinholes to connect adjoining mats.

TECHNICAL FIELD

The present invention relates to a lining member for temporarily restoring a road surface when the road surface is to be excavated and construction work performed on gas, water, sewer, or other pipelines; and to a method for temporarily restoring a road surface using the lining member.

BACKGROUND ART

A channel is excavated in construction work for laying pipes when new piping is to be buried under a road surface, or in construction work for laying temporary or permanent piping when it is necessary to repair or replace previously buried pipes such as gas, water, or sewer pipes. However, each section (normally one day's construction work) of the excavated channel is temporarily backfilled, and a temporary asphalt paving (temporary restoration construction work) is applied so as not to impede the passing of vehicles and pedestrians.

When the construction work on the piping is complete, the asphalt paving used for temporary restoration construction work is entirely removed, and the pavement is restored.

The asphalt used in temporary restoration construction work thus ultimately ends up as industrial waste, and therefore temporary paving is not desirable in temporary restoration construction work in view of efficiency in the construction work, resource conservation, environmental issues, and the like.

As an answer to this issue, the use of a member for temporary restoration has been proposed in place of the temporary paving. For example, there is disclosed in Patent Document 1 (Japanese Laid-open Patent Application No. 10-37113) a temporarily restored road surface in which a pressure member and a rubber mat are employed as a temporary restoration member, hollow bars are placed at a predetermined spacing on the excavated road surface (the surface from which the pavement has been removed), and coupled pressure members are placed in a substantially parallel arrangement, above which rubber mats wider than the width of the excavated road surface are placed to provide cover.

In Patent Document 2 (Japanese Laid-open Patent Application No. 2004-52410), a simulated roadbed material and rubber mats are employed as the temporary restoration member. The simulated roadbed material is formed from waste plastic, and the rubber mats are laid out on top of the simulated roadbed material.

PRIOR ART DOCUMENTS Patent Documents

-   [Patent Document 1] Japanese Laid-open Patent Application No.     10-37113 -   [Patent Document 2] Japanese Laid-open Patent Application No.     2004-52410

DISCLOSURE OF THE INVENTION Problems the Invention is Intended to Solve

In the method using the conventional lining members for temporary restoration, the pressure member/simulated roadbed material and the rubber mat are in a two-layer structure, as disclosed in Patent Documents 1 and 2. When vehicles run over the temporarily restored road surface, the weight of the vehicles is received by the pressure members/simulated roadbed material, and therefore no particular problems are engendered. However, the structure of the pressure members is complicated, and production costs commensurate with the simulated roadbed are required, so that problems are presented in terms of high expenses for either prior art method.

In terms of construction work as well, it is necessary to make the excavation width correspond to the width of the pressure members or simulated roadbed material. With the backfilling, it is necessary to backfill to an extent commensurate with the thickness of the surface-compacted body or the simulated roadbed, and if the height of the backfill is higher or lower, a difference in grade will result. Therefore, problems are presented in terms of construction conditions.

When vehicles are allowed to run on the temporarily restored surface, the backfilled dirt or sand is often surface-compacted and caused to sink by the weight of the vehicles. This sinking causes the temporarily restored road surface to be uneven, presenting a problem in that smooth traffic of vehicles over the surface is impeded.

Accordingly, the present invention proposes a novel member for temporarily restoring a road surface and a method for temporarily restoring a road surface using the member, in which construction work is simplified by employing a simple temporary restoration member, and vehicles are unlikely to be impeded when running over the temporarily restored surface.

Means for Solving the Abovementioned Problems

The member for temporarily restoring a road surface according to the present invention (claims 1, 10, and 12) comprises a lining mat, a nonslip pin, a lock pin, a stopper, and a fixing pin; the lining mat is formed from a rectangular rubber plate, a triangular rubber plate, or a rubber plate of another polygonal shape having appropriate rigidity; the lining mat is provided with a thick central part in which a central portion corresponding to an excavation of the road surface is thickly formed, thin side parts wherein predetermined sides of the thick central part are thinly formed, and pinholes that pass completely through the mat from a front surface to a reverse surface at appropriate sites on the thick central part near the corners; the nonslip pin has a cylindrical shape, is inserted into a pinhole of the lining mat, and has a length such that an appropriate length protrudes from the bottom surface of the lining mat when the nonslip pin is inserted; the lock pin is inserted into the cylindrical part of the nonslip pin and has a length such that an appropriate length protrudes from under the nonslip pin when the lock pin is inserted; the stopper is provided with latching protrusions that protrude from the top of an appropriately shaped base plate and are installed in the pinholes of the lining mat, and is provided with a through hole at an appropriate site; and the fixing pin can be driven via the through hole of the stopper.

The method for temporarily restoring a road surface according to the present invention (claim 16) is a method for temporarily restoring a road surface in which a paved road surface is excavated to perform predetermined construction work, and the excavation site is temporarily restored, characterized in that the excavation site is backfilled nearly to the height of the road surface, the lining mat is then laid out so as to cover the backfilled surface so that the ends of the thin side parts are positioned on the paved road surface, the cylindrical nonslip pin is driven through a pinhole and into the backfilled ground so that a bottom part of the pin protrudes by an appropriate amount from the bottom surface of the lining mat, and the lock pin is driven through the cylindrical part of the nonslip pin and into the backfilled ground so that a bottom part of the pin protrudes by an appropriate amount from the bottom end of the nonslip pin to fix the lining mat.

Furthermore, the method for temporarily restoring a road surface according to the present invention (claim 20) is characterized in that a stopper and a fixing pin are employed to fix a lining mat in the method for temporarily restoring a road surface, the stopper is disposed on the lower surface of each of the adjoining lining mats, latching protrusions are installed in the pinholes, and the fixing pin is driven via the through hole of the stopper that is positioned protruding from the excavation ground surface outside the backfill area from which only the paved surface has been removed and into the ground to fix the lining mat.

In order to temporarily restore the excavation site after the paved road surface has been excavated to perform predetermined construction work, the excavation site is backfilled nearly to the height of the road surface, and the excavation channel is covered by a single lining mat or connected lining mats having a predetermined shape/dimensions corresponding to the shape (planar shape) of the excavation channel. The backfilled site is temporarily restored by placing the lining mats in a particular manner so that the thin side parts of the lining mats are positioned on the paved road surface and the thick central parts are positioned above the backfilled site, and driving the nonslip pins and the lock pins into the backfill dirt to fix the lining mats, or by installing the latching protrusions of the stoppers in the pinholes of the lining mats to couple the stoppers to the lining mats and fixing the stoppers with the fixing pins.

In a case in which the nonslip pins and the lock pins are employed to fix the lining mats, as in the invention of claim 16, each of the nonslip pins is thick and driven in to a shallow point, the pins are readily driven in, and sufficient strength is provided even when force is applied in a lateral direction. Also, each of the lock pins has a small diameter, and therefore can readily be driven in to a deep point.

When the stoppers and the fixing pins are employed, as in the invention of claim 20, the latching protrusions are installed in the pinholes, and the fixing pins are driven into an unexcavated site rather than the backfilled site of the excavation channel to firmly fix the lining mats.

The member for use in construction work for temporarily restoring a road surface according to the present invention (claim 15) is configured as a plurality of ruler plates formed in shapes corresponding to an excavation width of a road surface, and corresponding to the shape of the thick central part in the lining mats of claims 1 to 6 that have a variety of dimensions and shapes. Before the road surface is excavated, an appropriate shape is selected for the ruler plates and the ruler plates are laid out in a configuration matching the shape of the excavation channel. The paved surface of the road is cut into and channel excavation is performed following the ruler plates, and lining mats that correspond to the ruler plates are used to temporarily restore the road surface. The shape and dimensions of the lining mats to be used in the construction work for temporarily restoring a road surface are determined by the arrangement of the ruler plates that corresponds to the shape of the excavation channel, and therefore the lining mats can reliably cover the backfilled site.

When the lining mat has thin side parts provided to the four peripheral edges (claim 2), the lining mat is primarily used for temporarily restoring an excavation hole, or is used as a stand-alone lining mat or in combination with a secondary lining mat.

The lining mat according to claim 3 is a triangular lining mat having thin side parts provided to a base side edge and apex portion, and can accommodate a case in which the excavation channel is excavated in a curve.

The lining mat according to claim 4 has thin side parts provided to appropriate peripheral edges of the lining mat, and a linking protrusion that corresponds to the shape of an empty space underneath the thin side parts provided to the peripheral edge on which no thin side part is formed; and is used as the secondary lining mat of the lining mat according to claim 2.

In the lining mat according to claim 5, the entirety of the mat has a long rectangular shape, the thick central part corresponds to the width of the excavation channel in the road surface, a coupling protrusion made to protrude from a lower portion of the lining mat is provided to an end surface on one side, and a coupling depression that corresponds to the coupling protrusion is provided to an end surface on the other side. The coupling protrusion is fitted into the coupling depression of an adjoining lining mat to integrally connect the lining mats in a line, and the mats are therefore used in restoration construction work in a case where a long excavation channel is excavated.

The lining mat according to claim 6 has a plurality of shallow depressions that are oriented parallel to a side edge provided to the bottom surface of the thick central part. After the temporary restoration, should the backfilled site be surface-compacted by the weight of moving vehicles and the thick central part on the backfill sink down due to the surface compaction, the lining mat simply bends so as to bulge downward due to the depressions formed on its reverse surface and adapts to the surface of the backfill. Moving vehicles therefore run on the temporarily restored surface unimpeded.

The lining mat according to claims 7 and 8 has a reinforcing metal mesh member installed in the interior, or has a two-layer structure in which a hard rubber material is formed on the front surface and a slightly soft rubber material is formed on the reverse surface, reinforcing the lining mat and thereby improving the durability thereof.

The lining mat according to claim 9 has small prongs, very small protrusions, fine channels, or the like formed on the front surface to impart a nonslip function, allowing for the safe passage of pedestrians on the restored road surface (lining mats).

In a case in which the nonslip pin and the lock pin are employed, particularly when an upper part of the pinholes and a shape of a head part of both pins are formed so that the head parts of the nonslip pin and the lock pin do not protrude from the top surface of the lining mat when a predetermined insertion is made, and are formed at a size imparting sufficient planar surface area to receive the weight of vehicles running on the road surface (claim 11), both pins receive sufficient weight from the moving vehicles and sink together with the downward bulge of the lining mat at the same time that the backfilled surface sinks due to the vehicles running thereon after temporary restoration, so that the pins do not protrude from the top surface of the lining mat.

When employing the stopper provided with latching protrusions that protrude from the top of an appropriately shaped base plate and are installed in the pinholes of predetermined adjoining lining mats when the mats are coupled along the end edge portions (claims 18, 22), adjoining lining mats are integrated and fixed in place, and the entire assembly of lining mats offers resistance to moving vehicles, preventing the mats from slipping.

Effect of the Invention

The present invention has the above structure, does not require that a surface-compacted body or a simulated roadbed such as that used in conventional methods be used in the temporary restoration construction work of a paved road surface, and allows costs and construction work to be streamlined. The present invention also can respond flexibly to further surface compaction of the backfill dirt or sand after the temporary restoration due to vehicles running on the surface, without impeding the vehicles in any way. Furthermore, the thin side parts jut out to the paved road surface, and therefore the backfill dirt or sand does not scatter.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view (before construction work) of the entire road surface shown in an embodiment of the method of the present invention;

FIG. 2 is the same view of the laid-out ruler plates;

FIG. 3 is the same view of the road surface when excavated;

FIG. 4 is the same view of the lining mats during construction;

FIG. 5 is an explanatory drawing of the member for temporarily restoring a road surface (entire lining mats having the basic shape);

FIG. 6 is a cross-sectional view of one of the lining mats;

FIG. 7 is a perspective partial view of each member;

FIG. 8 is an explanatory drawing of the ruler plates;

FIG. 9 is a cross-sectional view of a temporary restoration site of the method of the present invention (the stoppers being used);

FIG. 10 is an enlarged partial view of FIG. 9;

FIG. 11 is another exemplary view of an individual stopper;

FIG. 12 is the same view;

FIG. 13 is a cross-sectional view of a temporary restoration site of the method of the present invention (the nonslip pins and the lock pins being used);

FIG. 14 is a perspective view of another example of the lining mats;

FIG. 15 is an explanatory drawing of the mats (a cross-sectional view of the mats using the metal mesh member);

FIG. 16 is an explanatory drawing of the mats (a cross-section view of the two-layer structure); and

FIG. 17 is a cross-sectional view of another example of the mats.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention are described below. The target of the present invention is mainly temporary restoration construction work performed when a long excavation channel C has been excavated in a road surface B, such as the construction work for replacing the buried piping A exemplified in FIG. 1 (first embodiment); and temporary restoration construction work performed when an excavation hole E has been excavated in order to replace/install buried equipment (branched piping), or to install a service pipe leading to a building D (second embodiment).

The member for temporarily restoring a road surface in accordance with the first embodiment is configured from lining mats 1 (1 a, 1 b, 1 c . . . ), nonslip pins 2, lock pins 3, stoppers 4, 4 a, fixing pins 5, and ruler plates 6 (6 a, 6 b, 6 c . . . ).

The lining mats 1 are rectangular rubber plates used as mats on the original road surface and provided with appropriate flexibility and durability. The lining mats 1 have a basically long rectangular shape that is wider than the excavation channel B excavated during regular construction work on the buried piping A. A thick central part 11 is formed spanning between the lengthwise ends of the lining mats in a shape that thickens and bulges upward, and two thin side parts 12 are formed gradually thinner by steps. The mats are shaped bulging upward across the entire excavation channel C, making a hollow surface curving slightly upward between both sides of the reverse surface (the reverse surface of the thick central part).

The surface of each of the lining mats 1 is provided with very small prongs or projections, or with fine channels, forming a nonslip rough surface 14. A plurality of depressions 15 shaped as shallow semicircles in cross section and oriented parallel to the lateral sides of the mat is provided to the reverse surface of each of the mats. Pinholes 16 that pass completely through the mats from the front surface to the reverse surface are further provided at appropriate locations. In particular, end edges 17 are formed in an acutely angled shape with a gradual change in thickness.

A coupling protrusion 18 that protrudes from a bottom portion is provided to the end face on one side of each of the mats, and a coupling depression 19 corresponding to the coupling protrusion 18 is provided to the end face on the other side.

The lining mats 1 have the basic structure described above, and can therefore be formed in a plurality of ways to predetermined dimensions/shape. Long lining mats 1 a and short lining mats 1 b can be formed to accommodate the length of the excavation channel C. In addition, trapezoidal lining mats 1 c, triangular lining mats 1 d, and arrow-like lining mats 1 e shaped to cover an appropriate region on a corner of the excavation channel C can be formed as modified lining mats for covering locations where the direction of excavation changes. Each lining mat 1 is provided with a thick central part 11 that substantially matches (having a slightly narrower width in the width direction of the ruler plate) a ruler plate 6 (6 a, 6 b, 6 c, 6 d), which, in turn, matches the shape of the above-mentioned excavation channel C.

Of course, it may not be necessary to prepare all of the modified lining mats 1 c, 1 d, 1 e. For example, by preparing and combining a plurality of triangular lining mats 1 d having different oblique-side angles, the triangular lining mats 1 d can correspond to a variety of curving excavation channels. The same may be said of the trapezoidal lining mats 1 c and the arrow-like lining mats 1 e.

The ruler plates 6 may be formed, at a predetermined excavation channel width (two reference widths of 600 mm and 400 mm), for example, as long ruler plates 6 a (FIG. 8α) corresponding to the long lining mats 1 a for excavation channel sections having a unit length of 2 m; short ruler plates 1 b (FIG. 8β) corresponding to a plurality of short lining mats 1 b having different dimensions for excavation channel sections having unit lengths of 1 m, 0.5 m, and the like; trapezoidal ruler plates 6 c corresponding to the trapezoidal lining mats 1 c and the triangular lining mats 1 d used at locations where the path of excavation bends; and arrow-like ruler plates 1 d (FIG. 8γ) corresponding to the triangular lining mats 1 d and the arrow-like lining mats 1 e.

The relationship for combining the trapezoidal ruler plates 6 c and the arrow-like ruler plates 1 d with the trapezoidal lining mats 1 c, the triangular lining mats 1 d, and the arrow-like lining mats 1 e is shown in FIGS. 8(δ), (ε), (σ).

A channel end lining mat 1A that has the coupling protrusion 18 but does not have the coupling depression 19, or conversely, a channel end lining mat that has the coupling depression 19 without having the coupling protrusion 18, or another such channel end lining mat is formed in advance as a modified example of the lining mats 1 used on the abovementioned excavation channel C, and the channel end lining mats are used on the end portions of the channel.

The lining mats 1 may also be formed so that the top surface is level, and the thick central part 11 bulges downward. The two thin side parts 12 may be formed with only the distal end (side end) portions thereof as sloped surfaces.

The pinholes 16 are provided within the region of the excavation channel C, and the upper portions thereof accommodate head parts 21, 31 of the above-mentioned nonslip pins 2 and lock pins 3, or head parts 42 a of latching protrusions 42 of the stoppers 4, 4 a in an embedded state. The pinholes 16 are shaped so as to provide a sufficient exposure surface area.

Each of the nonslip pins 2 is formed in a cylindrical shape, and the head part 21 is shaped as an open umbrella in a horn shape that corresponds to that of the upper portion of the pinhole 16. The overall length is such that the nonslip pin 2 can be inserted into the pinhole 16 of the lining mat 1 and have an appropriate length protrude from the bottom surface of the lining mat when inserted (a length sufficient to prevent the lining mat 1 from slipping laterally under the force of a lateral slipping action from a moving vehicle as described hereinafter, and to allow the pin to be readily driven into the surface-compacted, backfilled ground).

Each of the lock pins 3 is shaped so that the pin can be inserted into the cylindrical part of the nonslip pin 2 and so that the inserted head part 31 fits precisely inside the head part 21 of the nonslip pin 2. Each of the lock pins 3 also has an overall length that allows an appropriate length of the pin to protrude from the bottom end of the nonslip pin 2.

Each of the stoppers 4 is provided with a line of latching protrusions 42 protruding from the top surface of a base plate 41, and a through hole 43 punched at a predetermined location. The position from which the latching protrusion 42 protrudes forth is set so as to correspond to the distance of the pinhole 16 of the adjoining lining mat 1 when the coupling protrusion 18 of one of the lining mats 1 is fitted together with the coupling depression 19 of another lining mat 1 in order to connect the mats along the hereinafter described excavation channel C.

Each of the through holes 43 is provided to a position in a portion jutting to the side from a latching protrusion 42, in the portion of the road surface B in which the pavement has been removed, and in a range of the ground surface where the ground has not yet been excavated (exposed ground surface F) at the time that the excavation channel C is dug. Each of the fixing pins 5 is given a length that provides enough strength to sufficiently secure the lining mat 1 when the fixing pin 5 is driven into the exposed ground surface F via the through hole 43.

The stopper 4 a may also be employed as a separate stopper member to which the latching protrusions 42 are provided protruding in a line from the top surface of a rectangular base plate 41 a, and to which the through hole 43 is not provided, as exemplified in FIG. 12.

The method for temporarily restoring a road surface according to the present invention (first embodiment) is one in which, when the paved road surface B is to be excavated (the excavation channel C is to be formed), the piping A inside the excavation channel is replaced and installed, or other predetermined construction work is performed, the above-described member for temporary restoration is used to temporarily restore the road surface so that, after the day's construction work is complete, the excavation channel C will not impede the passage of vehicles or pedestrians.

Specifically, it is necessary to first strip the paved road surface B in order to excavate the excavation channel C. During this stripping operation, cuts are made in the road surface by a road surface cutter. However, in a case where, for example, during the cutting it is necessary to match the ruler plate 6 to the excavation channel C, particularly to the site of the excavation channel C where the piping A is buried, and to excavate a curving channel, ruler plates 6 having different dimensions/shapes are combined, lined up, and secured into place on top of the road surface (FIG. 2). The road surface cutter is caused to move along the ruler plates on the road surface to make the predetermined cuts, the paved surface is stripped, and the exposed ground is bored into until the site of the buried piping A is reached.

The excavation channel C is excavated (FIG. 3) within the range of the stripped portion of the road surface B, leaving unexcavated portions F on the edges at either side. When the temporary restoration is performed, dirt or sand (usually only sand is used) G is used to backfill the excavation channel C. The backfilled site is covered by the lining mats 1, and is slightly mounded and built up to match the shape of the hollow surfaces 13 on the reverse sides of the lining mats 1.

After the excavation channel C has been backfilled with the dirt or sand G or the like, the lining mats 1 are placed over the backfilled surface in a particular manner so that the thin side parts 12 are positioned on the paved road surface B.

In particular, the ruler plates 6 are combined and the excavation channel C is excavated when the backfilled surface is to be covered by the lining mats 1. Therefore, when the lining mats 1 a, 1 b, 1 c . . . that correspond to the shape/dimensions of the ruler plates 6 a, 6 b, 6 c . . . used in the road surface cutter operation are used, the backfilled excavation channel C can be reliably covered by the lining mats 1. In other words, the method for temporary restoration using the lining mats 1 can attain perfect coverage without the mats overlapping or gaps appearing therebetween, by using the ruler plates 6.

Expressed another way, in a case in which it is possible to lay out the ruler plates 6 perfectly, it is possible to attain complete coverage by the lining mats 1 when temporary restoration is performed. Therefore, when the excavation channel C is excavated, the combination of the ruler plates 6 determines how the lining mats 1 will be used.

The lining mats 1 laid out so as to cover the backfilled surface are integrally connected, with the coupling protrusion and the coupling depression 19 of adjoining lining mats 1 fitted together. The nonslip pins 2 and the lock pins 3 are sometimes used as fixing means for the lining mats 1, and the stoppers 4 and the fixing pins 5 are sometimes used. The former is used for fixing the lining mats 1 positioned at the ends of the backfilled site or at other appropriate sites, and the latter is used at the connection sites of adjoining lining mats 1.

In a case where the nonslip pins 2 and the lock pins 3 are used, each of the lining mats 1 is fixed by driving the nonslip pins 2 into the backfill dirt or sand G through the pinholes 16, and further driving the lock pins 3 through the cylindrical interior of the nonslip pins 2 and into the backfill dirt or sand H. In sites where it is recognized that the lock pins 3 are unnecessary, a cap may be installed for blocking the cylindrical part of each of the nonslip pins 2.

In a case where the stoppers 4 and the fixing pins 5 are used, each of the stoppers 4 is positioned on the bottom surface of adjoining lining mats 1, and the line of latching protrusions is passed through and locked into the pinholes 16 of the adjoining lining mats 1. The overhanging part of the base plate is positioned on the unexcavated portion F, and the fixing pin 5 is driven via the through hole 43, thereby fixing the lining mat 1 via the stopper 4 (refer to FIGS. 9, 10).

At locations where the lining mats 1 are unlikely to slip, such as locations where notably few cars run, the stoppers 4 a may be used to couple adjoining mats.

In this type of temporary restoration of the excavation channel C during construction work on buried piping, the excavation channel C is backfilled by the dirt or sand G and covered by the lining mats 1, dispensing with the need to use asphalt materials for the temporary restoration, and sufficient durability is achieved to withstand vehicles running upon the temporarily restored surface, dispensing with the need to lay a surface-compacted body or simulated roadbed beneath the mats.

In particular, by driving in large-diameter nonslip pins 2 to a shallow point and driving in small-diameter lock pins 3 to a deep point in the operation for fixing the lining mats 1, a simple process can be used to fix the lining mats 1 in a manner that provides sufficient strength.

In the operation for fixing the lining mats 1 that uses the stoppers 4, adjoining lining mats 1 are connected together by fitting together the coupling protrusions 18 and the coupling depressions 19. In cooperation with this, the adjoining lining mats 1 are also coupled using the stoppers 4, allowing the lining mats 1 to be completely integrated into one body, and the lining mats 1 to be more effectively fixed.

In the present invention, the end edges 17 of the lining mats 1 do not buck away from the paved road surface C, vehicles can run over the road surface unimpeded, and the backfill dirt or sand G is not scattered, even when the thick central parts 11 of the lining mats 1 sink into the ground. This is achieved by reducing the thickness of the side parts 2.

The thick central part 11 of each of the lining mats 1 is formed bulging upward, and the depressions 15 are formed in the reverse surface of each of the thick central parts 11 of the lining mats 1, thereby allowing the present method to be used to solve the problems derived from the backfill dirt or sand G sinking due to the additional surface compaction of the backfill dirt or sand G when vehicles run on top of the lining mats 1 after temporary restoration has been performed. Furthermore, rainwater does not collect on the lining mats 1 during rainy weather because the thick central part 11 bulges upward.

In a case where the nonslip pins 2 and the lock pins 3 are used, the surface area of the exposed head parts is made appropriately large, so that in a case where the weight of moving vehicles is applied, the head parts are pressed downward together with the lining mats 1, sink together with the thick central part 11 of each of the lining mats 1, and are maintained in that state. The head parts therefore do not protrude from the top surface even when the lining mats 1 have sunk down.

In a case where the stoppers 4 are used, even when force is applied by moving vehicles in the lateral slippage direction to some of the lining mats 1 as a result of the adjoining lining mats 1 being connected together, the force is accommodated by all of the connected lining mats 1, adding greater durability.

Thus, it is possible for vehicles to be safely run on the temporarily restored road surface without any hindrance, even when the backfill dirt or sand is surface-compacted by the moving vehicles, or force is applied in the slippage direction, when vehicles run on the temporarily restored road surface (on the lining mats 1) until the permanent restoration is completed.

Particularly in a case where the temporary restoration is used for a walkway portion, there is less of a risk that pedestrians will stumble over a step from the side edges of the mats, and the danger of slipping on the mat surface is reduced, when the nonslip rough surface 14 is formed on the surface of each of the lining mats 1 and the two thin side parts 12 are formed having end edges that are acutely angled in cross-section. A safe walkway can therefore be attained.

A member for temporarily restoring a road surface that is used for temporary restoration work in piping construction where an excavation hole E rather than a long channel is formed in the road surface B (second embodiment) is configured from lining mats 1B, 1C, and either a combination of nonslip pins 2 and lock pins 3 used in the same manner as in the first embodiment, or stoppers 4 b and fixing pins 5 exemplified in FIG. 11.

The lining mat 1B is formed from the same material as the above-described lining mats 1, but has thin side parts 12 a provided via a change in grade to the periphery of a thick central part 11 b. The surface of the lining mat 1B is provided with very small prongs or projections, or with fine channels or the like, forming a nonslip rough surface (small prongs are shown in the drawing) 14 a. The reverse surface bulges slightly. Pinholes 16 a that pass completely through the mat from the front surface to the reverse surface are provided to the four corner portions of the thick central part 11 a.

In the lining mat 1C used while being connected to the lining mat 1B, thin side parts 12 a similar to those provided to the lining mat 1B are provided to three peripheral edges, and a linking protrusion 111 that corresponds to the shape of the empty space underneath the thin side part 12 a of the lining mat 1B is provided to the peripheral edge devoid of the thin side part 12 a.

The lining mat 1B is reinforced by installing a metal mesh member 112 in the interior of the thick central part 11 a, or a two-layer structure is obtained in which a hard rubber material 113 is formed on the front surface and a slightly soft rubber material 114 is formed on the reverse surface to enhance strength and durability. This approach may, of course, also be applied in the lining mats 1, 1A of the above-described first embodiment.

Each of the stoppers 4 b has a latching protrusion 42 b provided protruding from one side of the upper surface of a base plate 41 b, as exemplified in FIG. 11. A through hole 43 a is punched into the other side. The positional relationship between the latching protrusion 42 b and the through hole 43 a is the same as for the latching protrusions 42 and the through hole 43 of the stopper 4 described above.

In the method for temporarily restoring a road surface according to the second embodiment, a rectangular excavation hole E is excavated in the paved road surface B, the excavation hole E is backfilled by dirt or sand G after predetermined construction work has been performed, and the backfilled sites are covered by the lining mats 1B, 1C. The backfilled site is therefore covered by a single lining mat 1B, and the above-described nonslip pins 2 and lock pins 3 are used to fix the lining mat 1B in place, in a case where the excavation hole E is a single rectangular hole. Alternatively, the stoppers 4 b and the fixing pins 5 may be used to fix the lining mat. The fixing means (driving of the pin or the like) is the same as with the first embodiment described above.

The lining mat 1C having the linking protrusion 111 is used in a case where the single lining mat 1 cannot cover the backfill site when the excavation hole E is excavated as consecutive short channel holes in order to install a service pipe leading to a building D. Each of the linking protrusions 111 is positioned below a thin side part 12 a of the lining mat 1B, the top surfaces (nonslip surfaces) are provided consecutively in a level manner, and the lining mats 1B, 1C are fixed in place. Of course, it is also possible to lay out the lining mats 1C consecutively.

KEY

-   1, 1A, 1B, 1C Lining mats -   1 a Long lining mat -   1 b Short lining mat -   1 c Trapezoidal lining mat -   1 d Triangular lining mat -   1 e Arrow-like lining mat -   11, 11 a Thick central part -   111 Linking protrusion -   112 Metal mesh member -   113 Hard rubber material -   114 Soft rubber material -   12, 12 a Thin side part -   13 Hollow surface -   14 Nonslip rough surface -   15 Depression -   16 Pinhole -   17 End edge -   18 Coupling protrusion -   19 Coupling depression -   2 Nonslip pin -   21 Head part -   3 Lock pin -   4 Head part -   4, 4 a, 4 b Stopper -   41, 41 a, 41 b Base plate -   42, 42 a, 42 b Latching protrusion -   43, 43 a Through hole -   5 Fixing pin -   6 Ruler plate -   6 a Long ruler plate -   6 b Short ruler plate -   6 c Trapezoidal ruler plate -   6 d Arrow-like ruler plate -   A Buried piping -   B Road surface -   C Excavation channel -   D Building -   E Excavation hole -   F Unexcavated portion (exposed surface) -   G Dirt or sand (backfill dirt or sand) 

1. A member for temporarily restoring a road surface, comprising: a lining mat formed from a rectangular rubber plate, triangular rubber plate, or other polygonal rubber plate having appropriate rigidity; the lining mat being provided with a thick central part in which a central portion corresponding to an excavation shape of the road surface is thickly formed, thin side parts wherein predetermined sides of the thick central part are thinly formed so that the reverse surface is hollowed out in steps, and pinholes that pass completely through the mat from a front surface to a reverse surface at appropriate sites on the thick central part near the corners.
 2. The member for temporarily restoring a road surface according to claim 1, wherein thin side parts are provided to the four peripheral edges of the rectangular lining mat.
 3. The member for temporarily restoring a road surface according to claim 1, wherein thin side parts are provided to a base side edge and apex portion in the triangular lining mat.
 4. The member for temporarily restoring a road surface according to claim 1 or 3, wherein thin side parts are provided to appropriate peripheral edges of the lining mat, and a linking protrusion that corresponds to the shape of an empty space underneath the thin side parts is provided to the peripheral edge on which no thin side part is formed.
 5. The member for temporarily restoring a road surface according to claim 1 or 3, wherein a coupling protrusion made to protrude from a lower portion of each of the lining mats is provided to an end edge on one side of the thick central part of the lining mat in the direction traversing the channel, and a coupling depression that corresponds to the coupling protrusion is provided to the other side.
 6. The member for temporarily restoring a road surface according to claim 1 or 2, wherein the entire member has a long rectangular shape, and a plurality of shallow depressions that are oriented parallel to a lengthwise side edge are provided to the bottom surface of the thick central part.
 7. The member for temporarily restoring a road surface according to claim 1, wherein a reinforcing metal mesh member is installed in the interior.
 8. The member for temporarily restoring a road surface according to claim 1, having a two-layer structure in which a hard rubber material is formed on the front surface and a slightly soft rubber material is formed on the reverse surface.
 9. The member for temporarily restoring a road surface according to claim 1, wherein small prongs, very small protrusions, fine channels, or the like are formed on the front surface to impart a nonslip function.
 10. A member for temporarily restoring a road surface comprising: a lining mat formed from a rectangular rubber plate, triangular rubber plate, or other polygonal rubber plate having appropriate rigidity, the lining mat being provided with a thick central part in which a central portion corresponding to an excavation shape of the road surface is thickly formed, thin side parts wherein predetermined sides of the thick central part are thinly formed so that the reverse surface is hollowed out in steps, and pinholes that pass completely through the mat from a front surface to a reverse surface at appropriate sites on the thick central part near the corners; a cylindrical nonslip pin for inserting into the pinholes in the lining mat, and having a length such that an appropriate length protrudes from a bottom surface of the thick central part of the lining mat when the nonslip pin is inserted; and a lock pin for inserting into the cylindrical part of the nonslip pin, and having a length such that an appropriate length protrudes from under the nonslip pin when the lock pin is inserted.
 11. The member for temporarily restoring a road surface according to claim 10, wherein an upper part of the pinholes and a shape of a head part of both pins are formed so that the head parts of the nonslip pin and the lock pin do not protrude from the top surface of the lining mat when a predetermined insertion is made; and are formed at a size imparting sufficient planar surface area to receive the weight of vehicles running on the road surface.
 12. A member for temporarily restoring a road surface, comprising: a lining mat formed from a rectangular rubber plate, triangular rubber plate, or other polygonal rubber plate having appropriate rigidity, the lining mat being provided with a thick central part in which a central portion corresponding to an excavation shape of the road surface is thickly formed, thin side parts in which predetermined sides of the thick central part are thinly formed so that the reverse surface is hollowed out in steps, and pinholes that pass completely through the mat from a front surface to a reverse surface at appropriate sites on the thick central part near the corners; a stopper provided with a latching protrusion that protrudes from the top of an appropriately shaped base plate and is installed in the pinholes of the lining mat, and provided with a through hole at an appropriate site; and a fixing pin that can be driven through the through hole.
 13. A member for temporarily restoring a road surface, comprising: a lining mat formed from a rectangular rubber plate, triangular rubber plate, or other polygonal rubber plate having appropriate rigidity, the lining mat being provided with a thick central part in which a central portion corresponding to an excavation shape of the road surface is thickly formed, thin side parts in which predetermined sides of the thick central part are thinly formed so that the reverse surface is hollowed out in steps, and pinholes that pass completely through the mat from a front surface to a reverse surface at appropriate sites on the thick central part near the corners; and a stopper provided with a latching protrusion that protrudes from the top of an appropriately shaped base plate and is installed in the pinholes of adjoining lining mats when predetermined adjoining lining mats are linked consecutively at end edge portions.
 14. The member for temporarily restoring a road surface according to claim 13, comprising: a stopper provided with a base plate jutting out from a side of a line of latching protrusions, and provided with a through hole in the jutting surface; and a fixing pin that can be driven through the through hole.
 15. A member for use in construction work for temporarily restoring a road surface, comprising a plurality of ruler plates formed in shapes corresponding to an excavation width of a road surface, and corresponding to the shape of the thick central part in the lining mats of claim 1 that have a variety of dimensions and shapes.
 16. A method for temporarily restoring a road surface in which a paved road surface is excavated to perform predetermined construction work, and the excavation site is temporarily restored, the method for temporarily restoring a road surface characterized in that: the excavation site is backfilled nearly to the height of the road surface; a lining mat formed from a rectangular rubber plate having appropriate rigidity, and provided with a thick central part in which a thick central portion corresponding to an excavation shape of the road surface is thickly formed, thin side parts in which predetermined sides of the thick central part are thinly formed so that the reverse surface is hollowed out in steps, and pinholes that pass completely through the mat from a front surface to a reverse surface at appropriate sites on the thick central part near the four corners, is then laid out so as to cover the backfilled surface so that the ends of the thin side parts are positioned on the paved road surface; and a cylindrical nonslip pin is driven through the pinholes and into the backfilled ground so that a bottom part of the pin protrudes by appropriate amount from the bottom surface of the lining mat, and a lock pin is driven through the cylindrical part of the nonslip pin and into the backfilled ground so that a bottom part of the pin protrudes by an appropriate amount from the bottom end of the nonslip pin to fix the lining mat.
 17. The method for temporarily restoring a road surface according to claim 16, wherein when the lining mats have been laid out so as to cover the backfilled surface so that the ends of the thin side parts are positioned on the paved road surface, and in a case where the thin side parts are positioned on the backfilled surface, lining mats having a linking protrusion that corresponds to the shape of the empty space underneath the thin side parts and is provided to the peripheral edge on which no thin side part is formed are disposed next to each other to cover the backfilled surface, and the coupling linking protrusion of one of the adjoining lining mats is inserted underneath the thin side part of another adjoining lining mat to connect the adjoining lining mats.
 18. The method for temporarily restoring a road surface according to claim 16, wherein: a long lining mat is laid out on top of the backfilled surface of the channel-shaped excavation site, said long lining mat including the lining mats, each provided with a coupling depression and a coupling protrusion at either end and coupled to form a line; a stopper provided with a line of latching protrusions protruding from the top of a base plate at a predetermined spacing is disposed on the lower surface of the adjoining lining mats; and the latching protrusions of the stopper are installed in the pinholes of the adjoining lining mats to connect the adjoining lining mats.
 19. The method for temporarily restoring a road surface according to claim 16, wherein: before the road surface is excavated, a plurality of ruler plates formed in shapes corresponding to the shape of the thick central part of the lining mats are laid out in a configuration matching the shape of the excavation channel; the paved surface of the road is cut into and channel excavation is performed following the ruler plates; and lining mats that correspond to the ruler plates are used.
 20. A method for temporarily restoring a road surface in which a paved road surface is excavated to perform predetermined construction work, and the excavation site is temporarily restored, the method for temporarily restoring a road surface characterized in that: the excavation site is backfilled nearly to the height of the road surface; a lining mat formed from a rectangular rubber plate having appropriate rigidity, and provided with a thick central part in which a thick central portion corresponding to an excavation shape of the road surface is thickly formed, thin side parts in which predetermined sides of the thick central part are thinly formed so that the reverse surface is hollowed out in steps, and pinholes that pass completely through the mat from a front surface to a reverse surface at appropriate sites on the thick central part near the four corners, is then laid out so as to cover the backfilled surface so that the ends of the thin side parts are positioned on the paved road surface; a stopper provided with latching protrusions that protrude from the top of an appropriately shaped base plate and are installed in the pinholes of the lining mats, and provided with a through hole at an appropriate site, is disposed on the lower surface of the lining mat; the latching protrusions are installed in the pinholes; and a fixing pin is driven via the through hole of the stopper that is positioned protruding from the excavation ground surface outside the backfill area from which only the paved surface has been removed, and into the ground to fix the lining mat.
 21. The method for temporarily restoring a road surface according to claim 20, wherein when the lining mats have been laid out so as to cover the backfilled surface so that the ends of the thin side parts are positioned on the paved road surface, in a case where a thin side part is positioned on the backfilled surface, lining mats having a linking protrusion that corresponds to the shape of an empty space underneath the thin side part provided to the peripheral edge on which no thin side part is formed are disposed next to each other to cover the backfilled surface, and the linking protrusion of one of the adjoining lining mats is inserted underneath the thin side part of another adjoining lining mat to connect the adjoining lining mats.
 22. The method for temporarily restoring a road surface according to claim 20, wherein: a long lining mat is laid out on top of the backfilled surface of the channel-shaped excavation site, said long lining mat including the lining mats, each provided with a coupling depression and a coupling protrusion at either end and coupled to form a line; a stopper provided with a line of latching protrusions protruding from the top surface of a base plate at a predetermined spacing is disposed on the lower surface of the adjoining lining mats; and the latching protrusions of the stopper are installed in the pinholes of the adjoining lining mat to connect adjoining lining mats.
 23. The method for temporarily restoring a road surface according to claim 20, wherein: before the road surface is excavated, a plurality of ruler plates formed in shapes corresponding to the shape of the thick central part of the lining mats are laid out in a configuration matching the shape of the excavation channel; the paved surface of the road is cut into and channel excavation is performed following the ruler plates; and lining mats that correspond to the ruler plates are used. 